Detective Murdoch investigates the death of a young female student attending a residential boarding school in Toronto. She was found on the school grounds in a fountain and Dr. Ogden confirms that she drowned. Somewhat ominously, she has several cuts and the doctor confirms she had lost 3 pints of blood. She also has what appears to be two bite marks on her neck. Constable Crabtree, who has been reading Dracula by Bram Stoker is convinced they have a vampire on the loose. Murdoch looks for a more realistic explanation and finds that several other girls at the school have been going out late at night and meeting a handsome young man - and who they too claim is a vampire.